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EUVD-2026-232604

fkie_cve-2022-39222

Dex is an identity service that uses OpenID Connect to drive authentication for other apps. Dex instances with public clients (and by extension, clients accepting tokens issued by those Dex instances) are affected by this vulnerability if they are running a version prior to 2.35.0. An attacker can exploit this vulnerability by making a victim navigate to a malicious website and guiding them through the OIDC flow, stealing the OAuth authorization code in the process. The authorization code then can be exchanged by the attacker for a token, gaining access to applications accepting that token. Version 2.35.0 has introduced a fix for this issue. Users are advised to upgrade. There are no known workarounds for this issue.

GHSA-vh7g-p26c-j2cw — Dex vulnerable to Man-in-the-Middle allowing ID token capture via intercepted authorization code

Affected: Go: github.com/dexidp/dex

### Impact Dex instances with public clients (and by extension, clients accepting tokens issued by those Dex instances) are affected by this vulnerability.

An attacker can exploit this vulnerability by making a victim navigate to a malicious website and guiding them through the OIDC flow, stealing the OAuth authorization code in the process. The authorization code then can be exchanged by the attacker for a token, gaining access to applications accepting that token.

### Steps to reproduce

1) A victim navigates to a malicious website

2) The webserver initiates a connection with a Dex instance directly - https://dexexample.com/auth/https:%252F%252Faccounts.google.com?access_type=online&client_id=example&nonce=2AaJAimQU9CbeOFsNra1d7CJTWB&redirect_uri=http%3A%2F%2Flocalhost%3A40393%2Fauth%2Fcallback&response_type=code&scope=openid+email&state=2AaJAjhpUmsB25csCo5muvorMTl. In this example, the Dex instance is hosted on `dexexample.com`, and the connector is `accounts.google.com`.

3) Dex returns a 302 Redirect to the connector IDP, https://accounts.google.com/o/oauth2/v2/auth?client_id=237800849078-hri2ndt7gdafpf34kq8crd5sik9pe3so.apps.googleusercontent.com&redirect_uri=https%3A%2F%2Fdexexample.com%2Fauth%2Fcallback&response_type=code&scope=openid+email&state=g3dkmpontsr3ugocoddjx72ef. The attacker records the state parameter value g3dkmpontsr3ugocoddjx72ef which will be used as the request ID later on.

4) The malicious website redirects the victim’s browser to the connector…

gsd-2022-39222

RHSA-2023:7725 — Red Hat Security Advisory: RHACS 4.3 enhancement and security update

dexidp: gaining access to applications accepting that token

WID-SEC-W-2023-3113 — Red Hat Advanced Cluster Security: Schwachstelle ermöglicht Offenlegung von Informationen

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Red Hat Advanced Cluster Security ausnutzen, um Informationen offenzulegen.